Wang Kai, Lei Hong, Shi Liang, Zhang Ri Sheng, Song Li Ning
College of Environmental Sciences and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China.
Liaoning Institute of Sandy Land Management and Utilization, Fuxin 123000, Liaoning, China.
Ying Yong Sheng Tai Xue Bao. 2019 Sep;30(9):2883-2891. doi: 10.13287/j.1001-9332.201909.001.
To provide theoretical basis for management of Pinus sylvestris var. mongolica mixed plantation, the variation of soil carbon, nitrogen and phosphorus stoichiometry in different P. sylvestris var. mongolica belt-mixed plantations were explored. Taking the monoculture plantation as control, soil samples were collected at the distance of 0, 1, 2, 3, and 4 m from the center point in P. sylvestris var. mongolica and Ulmus pumila mixed plantation and P. sylvestris var. mongolica and Maackia amurensis mixed plantation along the two directions of P. sylvestris var. mongolica and its associated species in different soil layers. Contents and stoichiometric ratios of soil organic C, total N, total P, available N, available P were analyzed. The results showed that soil organic C, total N, and available N in P. sylvestris var. mongolica mixed plantations were higher than those in pure plantation. The soil organic C, total N contents, C/N and C/P in deep soil layers were increased under P. sylvestris var. mongolica and U. pumila mixed plantation. The soil N content increased but P content decreased in P. sylvestris var. mongolica and M. amurensis mixed plantation. With the increases of distance from the center of mixed plantation, soil C/N firstly increased and then decreased, while soil total P and available P contents decreased and N/P increased in P. sylvestris var. mongolica belt. Soil C/N decreased and available P contents firstly increased and then decreased with the increases of distance from the center in U. pumila belt of P. sylvestris var. mongolica and U. pumila mixed plantation. Soil total N content firstly decreased and then increased in P. sylvestris var. mongolica belt, but it firstly increased and then decreased in M. amurensis belt of P. sylvestris var. mongolica and M. amurensis mixed plantation. P. sylvestris var. mongolica mixed plantation could improve soil C and N stocks compared with pure plantation. The best mixed mode was P. sylvestris var. mongolica and U. pumila mixed by one row, as well as P. sylvestris var. mongolica and M. amurensis mixed in two rows.
为给樟子松混交林经营管理提供理论依据，探讨了不同樟子松带状混交林中土壤碳、氮、磷化学计量比的变化。以纯林为对照，在樟子松与榆树混交林以及樟子松与山槐混交林中，沿樟子松及其伴生树种的两个方向，在距中心点0、1、2、3和4 m处，于不同土层采集土壤样本。分析了土壤有机碳、全氮、全磷、碱解氮、有效磷的含量及化学计量比。结果表明，樟子松混交林中土壤有机碳、全氮和碱解氮含量高于纯林。樟子松与榆树混交林下深层土壤有机碳、全氮含量、C/N和C/P升高。樟子松与山槐混交林中土壤氮含量增加但磷含量降低。在樟子松带状区域，随着距混交林中心距离的增加，土壤C/N先升高后降低，而土壤全磷和有效磷含量降低，N/P升高。在樟子松与榆树混交林的榆树带状区域，随着距中心距离的增加，土壤C/N降低，有效磷含量先升高后降低。在樟子松带状区域，土壤全氮含量先降低后升高，但在樟子松与山槐混交林的山槐带状区域，土壤全氮含量先升高后降低。与纯林相比，樟子松混交林可提高土壤碳和氮储量。最佳混交模式为樟子松与榆树一行混交，以及樟子松与山槐两行混交。
